806576 - IonMonkey: Investigate x86 and ARM disparity on benchmarks

Status: NEW

(Core :: JavaScript Engine, defect)

Description

[David Anderson [:dvander] - inactive, e-mail if emergency]

On x86, IonMonkey and v8 are roughly the same speed (give or take a few milliseconds). On ARM, IonMonkey is roughly 25-30% slower. We need to find out why. There are a few test cases where it's particularly noticeable:

  kraken-gaussian-blur
     x86: 190ms for Ion, 193ms for v8
     ARM: 6812ms for Ion, 1427ms for v8

  kraken-beat-detection
     x86: 228ms for Ion, 193ms for v8
     ARM: 2194ms for Ion, 1538ms for v8

  kraken-desaturate
     x86: 110ms for Ion, 110ms for v8
     ARM: 5592ms for Ion, 4260ms for v8

kraken-gaussian-blur looks like it has the largest disparity.

Comment 1

[David Mandelin [:dmandelin]]

Is this still valid?